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Re: Vision target
The target can be whatever size you like. In fact, cameras are pretty easy to fool in this respect. Double the distance to the camera, double the size of the target in both X and Y, and the image looks the same. This lets you use a small target as long as you think through the proportions and correct for the distance.
The targets can be printed, painted, or colored with a marker. My personal favorite was to purchase black vinyl from a fabric store, cut the inner and outer circle, and slap it on a white board. It clings, it releases, it folds and goes into a drawer. Full-size cost four dollars. From the left-overs, you can create half or fourth size as well. Be sure to scale the width of the ring.
Greg McKaskle
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